Abstract

Abstract. Conventional transmission in IPv6 over Networks of Resource Constrained Nodes (6lo) favours fixed-size packets and results in low net-work performance when bulk data transmission is required by applica-tions, for example firmware updating. To tackle this problem, we first investigate performance of bulk data transmission through large pack-ets and make two important observations. Then we propose an adaptive mechanism at IP layer to dynamically adjust packet size in 6lo. We im-plement the mechanism on Contiki OS and evaluate it through a series of experiments in Cooja. Experimental results demonstrate that our mech-anism outperforms Contiki standard implementation significantly from both reliability and goodput under various network conditions.